【单选题】当x 2 +y 2 +Dx+Ey+F=0为圆的一般方程时要满足什么条件________. ( )
【单选题】下列程序段的执行结果为______。 For x= 5 To 1 Step -1 For Y= 1 To 6-x Print Tab( Y+5);'*'; Next Y Print Next x
【单选题】下列程序段的执行结果为( )。x = 6For k = 1 To 10 Step -2 x = x + kNext kPrint k; x
【单选题】下列程序段的执行结果为______。S= 0: T= 0: U=0For X = 1 To 3 For Y = 1 To X For Z = Y To 3 S= S +1 Next Z T=T+1 Next Y U=U+1Next XPrint S TU